Skip navigation

Interactions of aqueous Cu2+, Zn2+ and Pb2+ ions with crushed concrete fines

Interactions of aqueous Cu2+, Zn2+ and Pb2+ ions with crushed concrete fines

Coleman, Nichola, Lee, W.E. and Slipper, Ian J. (2005) Interactions of aqueous Cu2+, Zn2+ and Pb2+ ions with crushed concrete fines. Journal of Hazardous Materials, 121 (1-3). pp. 203-213. ISSN 0304-3894 (Print), 1873-3336 (Online) (doi:10.1016/j.jhazmat.2005.02.009)

Full text not available from this repository.

Abstract

The crushing of reclaimed concrete-based demolition waste to produce recycled aggregate gives rise to a large volume of cement-rich fine material for which market development would be beneficial. It was envisaged that this fine fraction may prove to be an effective sorbent for aqueous heavy metal species by virtue of its ion exchangeable phases and high pH. A batch sorption study confirmed that crushed concrete, in the particle size range 1-2 mm, successfully excluded Cu2+ (35 mg g(-1)), Zn2+ (33 mg g(-1)) and Pb2+ (37 mg g(-1)) from aqueous media. Subsequent distilled water leaching of the metal-laden concrete particles indicated that 1.9, 0.9 and 0.2% of the bound metals, Cu2+, Zn2+ and Ph2+, respectively, were readily soluble. Scanning electron microscopy revealed that the removal of Cu2+ and Zn2+ arose from surface precipitation reactions, whereas, the principal mechanism of uptake of Ph2+ was found to be by diffusion into the cement matrix. The metal ion removal efficiency of crushed concrete fines is compared with those of other low cost sorbents and potential applications which may exploit this sorptive property are also discussed. © 2005 Published by Elsevier B.V.

Item Type: Article
Uncontrolled Keywords: Recycling, Cement, Demolition waste, Heavy metal ions, Sorbent, Crushed concrete
Faculty / Department / Research Group: Faculty of Engineering & Science
Last Modified: 14 Oct 2016 09:28
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
URI: http://gala.gre.ac.uk/id/eprint/11803

Actions (login required)

View Item View Item